What is the definition of supervised. The company I used to work for sent, on average, 20 two-man crews out to do new residential wiring. Neither had a license. They had three supervisors that were licensed to check on them and do estimating for the service department. I seriously doubt that every crew was checked everyday. On the commercial side, they had a crew leader that ran the job and I think very few of them were licensed.
Here in the Carolinas you aren't getting a license to be an electrician, you get a license to be an electrical contractor. As a licensed electrical I don't like the situation because it tends to drive down prices, but that's the way it is. It is, however, better than where I used to live (KY) no license no inspection required.